Chris, the BSF Canyon @ 4k is what I would call class 3. There are a couple of interesting drops that will give you a pulse of adrenaline when you see their horizon lines. The 1st one is aka Jake's Ledge has a big boulder undercut on the right, a confused holes in the center but a really cool, kinda hidden, sneak chute on the left. I like to run this on the right taking a right to left ferry in front of the undercut and slide in behind the center hole then out the bottom. This weekend Chief ran in straight down the middle @ 700cfs but your mileage may vary at higher levels:-) The left sneak is a class 2 move.
Here's a video of a bunch of BWA running the sneak @ 1350cfs - it will be even easier at 4k:-) :
[
www.americanwhitewater.org]
Here's a shot that shows the other side of Jake's Hole @ 700cfs - which really exposes that undercut.
The second one is this one - which looks like a mess from above the lip but is basically just a straight shot down the middle.
Meanwhile, don't worry be happy. It's summertime (!!) and there's so much water out there it's like picking between chocolate and strawberry...
barryg